<template>
<div>
  <!-- 面包屑导航区域 -->
  <el-breadcrumb separator-class="el-icon-arrow-right">
    <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>权限管理</el-breadcrumb-item>
    <el-breadcrumb-item>参数列表</el-breadcrumb-item>
  </el-breadcrumb>

  <!-- 卡片视图 界面列表 -->
  <el-card>

    <!-- 提示 -->
    <el-alert show-icon title="提示： 只允许为第三级分类设置相关参数" type="warning"
    :closable="false"></el-alert>

    <!-- 商品分类 -->
    <el-row class="cat_opt">
      <el-col>
        <span>选择商品的分类：</span>
        <!-- 商品分类级联 -->
        <el-cascader :options="catelist" :props="cateProps" v-model="selectedCateKeys"
        @change="handleChange"></el-cascader>
      </el-col>
    </el-row>

    <!-- tab 页签区域    :disabled: CSS3特性-->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
      <el-tab-pane label="动态参数" name='many'>
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i"
                closable @close="handeleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框   handleInputConfirm： 文本框失去焦或Enter都会触发-->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作" >
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-edit" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
      </el-tab-pane>
      <el-tab-pane label="静态属性" name='only'>
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态参数 -->
          <el-table :data="onlyTableData" border stripe>
             <!-- 展开 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i"
                closable @close="handeleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 输入的文本框   handleInputConfirm： 文本框失去焦或Enter都会触发-->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作" >
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon="el-icon-edit" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
      </el-tab-pane>
    </el-tabs>
  </el-card>

  <!-- 弹框 - 添加参数-->
  <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%"
   @close="addDialogClosed">
   <!-- 内容 -->
   <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
     <el-form-item :label="titleText" prop="attr_name">
       <el-input v-model="addForm.attr_name"></el-input>
     </el-form-item>
   </el-form>
   <span slot="footer" class="dialog-footer">
     <el-button @click="addDialogVisible = false">取 消</el-button>
     <el-button  type="primary" @click="addParams">确 定</el-button>
   </span>
  </el-dialog>

 <!-- 弹框 - 编辑修改          Ctrl + D 选中所有，上下键选择范围 -->
   <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%"
   @close="editDialogClosed">
   <!-- 内容 -->
   <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
     <el-form-item :label="titleText" prop="attr_name">
       <el-input v-model="editForm.attr_name"></el-input>
     </el-form-item>
   </el-form>
   <span slot="footer" class="dialog-footer">
     <el-button @click="editDialogVisible = false">取 消</el-button>
     <el-button  type="primary" @click="editParams">确 定</el-button>
   </span>
  </el-dialog>
</div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 数据的双向绑定到数组
      selectedCateKeys: [],
      // 默认被激活页的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 弹框隐藏 - 添加
      addDialogVisible: false,
      // 添加参数的表单对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 弹框隐藏 - 修改
      editDialogVisible: false,
      // 修改表单数据对象
      editForm: {},
      // 校验规则 - 修改表单
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  // 页面运行时加载函数
  created() {
    // 加载数据
    this.getCateList()
  },
  // 事件方法区
  methods: {
    // 获取所有商品分类列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data
    },
    // 监听级联选择框
    handleChange() {
      this.getParamsData()
    },
    // Tab 页签点击事件
    handleTabClick() {
      this.getParamsData()
    },
    // 获取参数列表
    async getParamsData() {
      //  级联选择只能为三级
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }

      //  选择级联  查询数据
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,
        { params: { sel: this.activeName } })

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败')
      }

      // 切割字符放回一个数组
      res.data.forEach(item => {
        // item.attr_vals.split(' ')以空格作为分隔符   据说现在都要以 , 为分隔符
        // 判断item.attr_vals是否为空值  （ 解决强行加入空字符也出有数组返回的情况 ）
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值  这里的值可以单独绑定
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加参数对话框的关闭事件
    async addDialogClosed() {
      // 重置对话框内容
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败')
        }
        this.$message.success('添加参数成功')
        this.addDialogVisible = false

        // 刷新列表
        this.getParamsData()
      })
    },
    // 对话框 - 编辑修改
    async showEditDialog(id) {
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${id}`, {
        params: { attr_sel: this.activeName }
      })

      if (res.meta.status !== 200) {
        this.$message.error('获取参数失败')
      }
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 清空表单
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
    },
    // 提交按钮 - 修改表单
    editParams() {
      // 下面if的判断都在 valid 方法里面
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        const { data: res } = await this.$http.put(`categories/${this.cateId}
        /attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })

        if (res.meta.status !== 200) {
          this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据id删除参数
    async removeParams(attrId) {
      const confirmResult = await this.$confirm('是否删除该参数', '提示', {
        confirmButtonText: '确定',
        cancelButtonRext: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消')
      }

      // 删除
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功')
      this.getParamsData()
    },
    // 文本框失去焦点，或摁下Enter 都会触发
    handleInputConfirm(row) {
      // trim(): 取出字符串   输入的可能是空格
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 添加输入的值  trim()取出字符串
      row.attr_vals.push(row.inputValue.trim())
      // 清空输入框
      row.inputValue = ''
      // 隐藏输入框
      row.inputVisible = false
      // 发起请求
      this.saveAttrVals(row)
    },
    // 点击按钮，展示文本框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // element方法    $nextTick：当页面元素重新被渲染时，回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数
    handeleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    },
    // 将attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败')
      }
      this.$message.success('修改参数成功')
    }

  },
  // 计算属性
  computed: {
    // 按钮需要被禁用，则返回true
    isBtnDisabled() {
      // 判断是否有选择下拉框
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中三级分类的ID
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题文本  动态切换文本标题
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }

}
</script>

<style lang="less" scoped>

.cat_opt {
  margin: 15px 0;
}

.el-tag {
  margin: 10px;
}

.input-new-tag {
  width: 120px;
}
</style>
